The bonding mill is a step that was added to the rolling process in 1965. It was necessitated by the switch to clad-composition coins in that year. A variety of clad compositions have been used over the years, with the most common being a copper-nickel clad sandwich. This has been used for circulation quality dimes, quarters, half dollars, Eisenhower dollars, and Susan B. Anthony dollars. In the production of clad strip for these issues, the bonding mill fuses a central strip of pure copper to two outer strips of copper-nickel. After bonding, the composite strip is sent through the rolling mill several more times until it is reduced to coin thickness.
You are here: Home / Bonding Mill